hi all

these are the codes that come up

p0715: input/turbine speed sensor malfunction
p1191: ETS limp home valve on(i looked this definition up online as report stated "manufacturer specific code")
P0306: misfire detected (cylinder 6)
p1159: variable induction system(i looked this definition up online as report stated "manufacturer specific code")
p1193: ETS limp home-low rpm(i looked this definition up online as report stated "manufacturer specific code")


the car will drive fine at times but sometimes ill b driving and my car will jolt suddenly and the rpm will suddenly go up.
then once i come to a stop the car wont accelerate, well i does but itll accelerate very slowly with no power till it gets up to about 30 mph.
it apparantly gets stuck in third gear and wont go down nor up. so what i do is manually bring it down to second as it wont go to first and then once it has
gained speed ill bring it back to third. i dont kno what to do as this problem isnt persistent. furthermore sometimes the cel will actually turn off and
the car will run perfectly. any help will surely b apreciated.

If it was my car, I'd replace both the input and output speed sensors. Then I'd do a trans fluid change with SP-III fluid. Then I'd change the spark plugs with OEM RC10PYP4 (CHAMPION).

Change your plugs and wires. I just went through very similar symptoms and months of irritation. I finally took it to the dealer, bought the NGK plugs and new wires from the dealer ($110 total) and switched them out in 2 hours. It's a pain in the A$$ but it's the cheapest thing to fix (although it's $350 at the dealer to get them to do it). You'll find step by step instructions on here, sorry I don't have the link.

Hope this helps and let us know how it goes!
mike

I think mikep and jsinton have the right idea. Here's why:

P0715: Input Speed Sensor
The computer can't get a good signal from the input speed sensor. To be safe, it limits you to 2nd and 3rd gear.

From what I've read here the speed sensors on the XG are sometimes a problem.

P1159: Intake Motor
The intake manifold changes shape for different engine speeds (wide for high RPM, narrow for low RPM). The computer couldn't confirm that it actually did. The motor or position sensor may not be working.

P0306: Misfire
The computer can't get cylinder 6 to work reliably. The other ones are OK. This can be caused by a number of things (valves, rings, etc) but most likely sparkplug 6. You usually change them in sets because if one is bad, the others will be close. Might as well do wires while you're working on it.

The other two describe how the computer dealt with the resulting rough idle.

P1191, P1193: Limp home (low RPM)
The computer detected a near stall (likely caused by the misfire), so it opened the back-up throttle (limp home valve). With any luck, these will go away with the new sparkplugs. This is where the missing power symptom probably comes from.

This post has been edited by wildweathel: Jan 27 2010, 11:40 PM